Words at Play : Words For Things You Didn't Know Have Names, Vol. 2
Definition:
a crowning ornament or detail (such as a decorative knob)
Example Sentence:
Attempting to impress the decorator, she made a show of inspecting the
lamp finials.
About the Word:
Finial developed from final. That makes sense, since the finial
is usually the final, crowning piece added to an object.